I've just finished a game as Sardus and I want to talk about it (and I think this is a good place). I played against other civs of yours and it was quite swell. The Nuraghians fit my usual defensive style well and I managed to live without wars for the majority of the game. Nuraghe is a great UB and it fits well with the culture. I liked suggestion to move it to mining as in it probably would alter my usual strategy, but it works well as it is now. UA's in my opinion unnecessary complicated, but it suggests the path you should take with nurs well.
My biggest struggle with the civ were texts tbh. The pedia entry looked a lot like the article on wikipedia and it highlighted same things. I find it slightly lazy as there are certainly better sources. And the rest of nurs' texts seems unpolished too. Like the introduction:
Introduction: "Welcome to the islands of Sardegna. You stand before the greatest hero of the Nuraghians, Sardus. State your business - and fast if you value your life."
I haven't played against nurs yet, but this is little forced even written.
Ipogeo could have a better model.
But I enjoyed my time with them and the design is good. It gives them an identity, which is quite difficult as they were more of a culture than a civ. And What I like the best is that It brought my attention to nurs. I was glad to learn something about them, Sardinia (if you're migrating to Civ VI, please consider making Guidicato of Arborea) and I even started thinking about visiting the island in the summer.
The new logo is great too. It simpler than the old one and it captures the antiquity of the civ better by my reckoning.
And one lore questions: Wouldn't it better to call them Illienses?
The same could be said about some of your other civs. I'm really enjoying reading about some of these obscure realms. Madagascar, Araucanía y Patagonia...
My favourites are:
Nurs - I like old Civs and they fit my style
Burundi - playing against it was quite frustrating as it was able to rush wonders by sacrificing workers. I loved it. The civ would deserve a new democracy screen.
Kalinago - in this case the leader screen is very pleasant and so are their colours. Caribs being an agressive, yet not really expansive civ is appropriate too. Another good civ to play against.
Araucanía and Patagonia - I think the idea is super clever and I love having such an obscure civ in my games.
Kasanje - I tried to play as Tartaross and they attacked me super soon with Gonzo taking over my second city single-handedly. Both their uus and ua are interesting and change the style you play the game.
Madagascar - My next game will be with them. They made me interested in Imerina, they got great colours and ui is very intriguing. I'll report on the kingdom once I'm finished.
Kanen-Bornu - I love their democracy screen and music. Their uniques make them a very compact civ, which could be used for any type of victory..
Tartessos - UU is a game-changer. UB is making it worse champa, but it fits the theme well. The civ's well suited for wide happy empire, so not really my style.